CA2532927A1 - Method of charging fine-grained metals into an electric-arc furnace - Google Patents
Method of charging fine-grained metals into an electric-arc furnace Download PDFInfo
- Publication number
- CA2532927A1 CA2532927A1 CA002532927A CA2532927A CA2532927A1 CA 2532927 A1 CA2532927 A1 CA 2532927A1 CA 002532927 A CA002532927 A CA 002532927A CA 2532927 A CA2532927 A CA 2532927A CA 2532927 A1 CA2532927 A1 CA 2532927A1
- Authority
- CA
- Canada
- Prior art keywords
- furnace
- electric
- arc furnace
- downpipe
- dosing orifice
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010891 electric arc Methods 0.000 title claims abstract 16
- 238000000034 method Methods 0.000 title claims abstract 12
- 239000002184 metal Substances 0.000 title claims abstract 8
- 229910052751 metal Inorganic materials 0.000 title claims abstract 8
- 150000002739 metals Chemical class 0.000 title claims abstract 4
- 239000013590 bulk material Substances 0.000 claims abstract 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract 3
- 230000005484 gravity Effects 0.000 claims abstract 2
- 239000000463 material Substances 0.000 claims abstract 2
- 239000000155 melt Substances 0.000 claims abstract 2
- 230000001681 protective effect Effects 0.000 claims 6
- 150000002736 metal compounds Chemical class 0.000 claims 5
- 239000000203 mixture Substances 0.000 claims 3
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Furnace Charging Or Discharging (AREA)
- Furnace Details (AREA)
Abstract
In a method of charging fine-grained metals, in particular directly reduced iron (DRI), into an electric-arc furnace (1), the metal is supplied via a downpipe (12) to an opening (10) provided in the furnace roof (4), is introduced into the furnace (1) through this opening (10) as bulk material stream (11), and falls onto the melt (13) merely by grav ity. Further, an electric-arc furnace (1) suited for this purpose is described. A rather loss-free introduction even of fine-grained material having a mean grain size of less than 1 mm is achieved by passing the bulk material stream (11) through a dosing orifice (8) after the downpipe (12) and before entering the furnace (1). The bulk material stream (11 ) then enters the furnace essentially undisturbed.
Claims (21)
1. A method of charging fine-grained metal, metal compounds or a mixture of two or more metals or metal compounds, in particular fine-grained directly reduced iron, into an electric-arc furnace (1), in which the metal, the metal compound or the mixture is supplied essentially continuously via at least one downpipe (12) to one or more open-ings (10) provided in the furnace roof (4), is introduced into the furnace (1) through said at least one opening (10) as a bulk material stream (11), and falls onto the melt (13) merely by gravity, characterized in that before entering the furnace (1) after the downpipe (12) the bulk material stream (11) is passed through a dosing orifice (8) and enters the furnace (1) essentially undisturbed.
2. The method as claimed in claim 1, characterized in that after the downpipe (12) the bulk material stream (11) is passed through a round or oval dosing orifice (8).
3. The method as claimed in claim 1, characterized in that after the downpipe (12) the bulk material stream (11) is passed through an iris.
4. The method as claimed in any of the preceding claims, characterized in that the dosing orifice (8) is inclined by not more than 25° with respect to the horizontal.
5. The method as claimed in any of claims 1 to 3, characterized in that the dosing orifice (8) is arranged horizontally.
6. The method as claimed in any of the preceding claims, characterized in that the mass flow of the bulk material stream (11) in the downpipe (12) is kept larger than the throughput through the dosing orifice (8).
7. The method as claimed in any of the preceding claims, characterized-in that after the dosing orifice (8) the bulk material stream (11) is passed through a protective tube (7).
8. The method as claimed in claim 7, characterized in that the protective tube (7) is cooled.
9. The method as claimed in any of the preceding claims, characterized in that the metal, metal compound or mixture of two or more metals or metal compounds intro-duced into the furnace (1) has a mean grain size of less than 1 mm, preferably less than 0.5 mm, particularly preferably less than 0.4 mm, and quite particularly preferably less than 0.3 mm.
10. An electric-arc furnace (1), in particular for charging with fine-grained directly reduced iron or ores by a method as claimed in any of claims 1 to 9, with a furnace roof (4) having at least one opening (10), the at least one opening (10) of the furnace roof (4) being connected with a downpipe (12) leading to the furnace lid (4) from outside for supplying the material to be charged, characterized in that at the opening of the downpipe (12) into the furnace (1) a preferably round or oval dosing orifice (8) is pro-vided.
11. The electric-arc furnace (1) as claimed in claim 10, characterized in that the dosing orifice (8) is an iris.
12. The electric-arc furnace (1) as claimed in claim 10, characterized in that the dosing orifice (8) has at least two slides (9) movable with respect to each other.
13. The electric-arc furnace (1) as claimed in any of claims 10 to 12, characterized in that the dosing orifice (8) is inclined with respect to the horizontal by not more than 25°.
14. The electric-arc furnace (1) as claimed in any of claims 10 to 12, characterized in that the dosing orifice (8) is arranged horizontally.
15. The electric-arc furnace (1) as claimed in any of claims 10 to 14, characterized in that the bulk recipient vessel constitutes a mass flow silo.
16. The electric-arc furnace (1) as claimed in any of claims 10 to 15, characterized in that the downpipe (12) is arranged vertically.
17. The electric-arc furnace (1) as claimed in any of claims 10 to 16, characterized in that below the dosing orifice (8) a preferably vertical protective tube (7) is provided.
18. The electric-arc furnace (1) as claimed in claim 17, characterized in that the length of the protective tube (7) is about 1 to 3 times the maximum diameter of the stream of bulk material.
19. The electric-arc furnace (1) as claimed in claim 17 or 18, characterized in that the protective tube (7) is cooled.
20. The electric-arc furnace (1) as claimed in any of claims 17 to 19, characterized in that the diameter of the protective tube (7) is at least twice as large as the opening diameter of the dosing orifice (8).
21. The electric-arc furnace (1) as claimed in any of claims 10 to 20, characterized in that the maximum opening diameter of the dosing orifice (8) is smaller than or equal to the diameter of the downpipe (12).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10333764A DE10333764B3 (en) | 2003-07-23 | 2003-07-23 | Charging fine, directly-reduced iron particles into arc furnace, passes stream of bulk material from downcomer through orifice plate, to enter furnace largely undisturbed |
| DE10333764,4-24 | 2003-07-23 | ||
| PCT/EP2004/007153 WO2005014868A1 (en) | 2003-07-23 | 2004-07-01 | Method of charging fine-grained metals into an electric-arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2532927A1 true CA2532927A1 (en) | 2005-02-17 |
| CA2532927C CA2532927C (en) | 2011-09-06 |
Family
ID=33483049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2532927A Expired - Fee Related CA2532927C (en) | 2003-07-23 | 2004-07-01 | Method of charging fine-grained metals into an electric-arc furnace |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US8391331B2 (en) |
| EP (1) | EP1660688B1 (en) |
| KR (1) | KR20060111902A (en) |
| CN (1) | CN1826417B (en) |
| AR (1) | AR045075A1 (en) |
| AT (1) | ATE350496T1 (en) |
| AU (1) | AU2004263608B2 (en) |
| BR (1) | BRPI0412256B1 (en) |
| CA (1) | CA2532927C (en) |
| DE (2) | DE10333764B3 (en) |
| EA (1) | EA008735B1 (en) |
| ES (1) | ES2279390T3 (en) |
| TW (1) | TW200508400A (en) |
| WO (1) | WO2005014868A1 (en) |
| ZA (1) | ZA200600897B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL1993325T3 (en) * | 2007-04-09 | 2012-02-29 | Graftech Int Holdings Inc | Graphite electrode of increased length |
| DE102010045825A1 (en) * | 2010-09-20 | 2012-03-22 | Intracon Gmbh | Charging shaft system and filling method |
| US9013778B2 (en) | 2013-03-06 | 2015-04-21 | Sage Electrochromics, Inc. | Laser cuts to reduce electrical leakage |
| US9152001B2 (en) | 2013-07-25 | 2015-10-06 | Sage Electrochromics, Inc. | Electrochromic devices having improved structure for reducing current leakage across lower transparent conductor layers |
| US20150153622A1 (en) | 2013-12-03 | 2015-06-04 | Sage Electrochromics, Inc. | Methods for producing lower electrical isolation in electrochromic films |
| JP2020508491A (en) | 2017-02-27 | 2020-03-19 | セイジ・エレクトロクロミクス，インコーポレイテッド | Electric device including substrate and transparent conductive layer and process for forming the same |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3258328A (en) * | 1962-08-23 | 1966-06-28 | Fuji Iron & Steel Co Ltd | Method and apparatus for treating steel |
| DE1217415B (en) * | 1964-05-21 | 1966-05-26 | Gussstahlwerk Oberkassel Ag Vo | Process for extracting the furnace gases and for regulating the furnace pressure of an electric arc furnace, in particular for steel production and device for carrying out the process |
| FR1536190A (en) | 1965-09-03 | 1968-08-27 | Metallgesellschaft Ag The Stee | Electric furnace steel preparation process |
| US3472650A (en) * | 1965-09-03 | 1969-10-14 | Canada Steel Co | Electric-arc steelmaking |
| US3385494A (en) * | 1966-09-15 | 1968-05-28 | Strategic Material Corp | Scrap melting |
| GB1193527A (en) | 1968-10-04 | 1970-06-03 | Ch Metall Zd | Electric-Arc Furnace for Melting Synthetic Slag. |
| BE755725A (en) * | 1969-10-23 | 1971-02-15 | Huettenwerk Oberhausen Ag | ARC OVEN EQUIPPED WITH AN IRON SPONGE CHARGING DEVICE |
| US4262057A (en) | 1979-06-21 | 1981-04-14 | Detrex Chemical Industries, Inc. | Metal drawing compound composition and method of use |
| GB2115011B (en) | 1982-02-17 | 1985-12-04 | British Steel Corp | Improvements in or relating to a process for melting and/or refining steel |
| US4514218A (en) * | 1984-06-06 | 1985-04-30 | Daidotokushuko Kabushikikaisha | Reduced iron melting method using electric arc furnace |
| FR2681937A3 (en) * | 1991-09-30 | 1993-04-02 | Irsid | Device for continuously loading metallic products in loose form into a metallurgical furnace and metallurgical furnace equipped with a loading device |
| AT400245B (en) * | 1993-12-10 | 1995-11-27 | Voest Alpine Ind Anlagen | METHOD AND SYSTEM FOR PRODUCING A MELTING IRON |
| DE19608532A1 (en) * | 1996-02-09 | 1997-08-14 | Eisenbau Essen Gmbh | Cooling the electrodes in an arc furnace during steel production |
| DE19744151C5 (en) * | 1997-10-07 | 2004-08-26 | Outokumpu Oyj | Process for melting fine-grained, directly reduced iron in an electric arc furnace |
| LU90327B1 (en) * | 1998-12-16 | 2000-07-18 | Wurth Paul Sa | Proc-d- for placing fines in a furnace - arc |
| DE19945489A1 (en) | 1999-09-22 | 2001-04-05 | Sms Demag Ag | Method and device for introducing bulk material into a metallurgical vessel |
| AT408663B (en) * | 2000-05-31 | 2002-02-25 | Voest Alpine Ind Anlagen | METHOD FOR MELTING IRON SPONGE AND ELECTRIC ARC FURNACE FOR IMPLEMENTING THE METHOD |
-
2003
- 2003-07-23 DE DE10333764A patent/DE10333764B3/en not_active Expired - Fee Related
-
2004
- 2004-07-01 EP EP04740520A patent/EP1660688B1/en not_active Not-in-force
- 2004-07-01 CA CA2532927A patent/CA2532927C/en not_active Expired - Fee Related
- 2004-07-01 US US10/566,033 patent/US8391331B2/en not_active Expired - Fee Related
- 2004-07-01 ZA ZA200600897A patent/ZA200600897B/en unknown
- 2004-07-01 WO PCT/EP2004/007153 patent/WO2005014868A1/en active IP Right Grant
- 2004-07-01 BR BRPI0412256-9A patent/BRPI0412256B1/en not_active IP Right Cessation
- 2004-07-01 KR KR1020067001568A patent/KR20060111902A/en not_active Application Discontinuation
- 2004-07-01 DE DE602004004159T patent/DE602004004159T2/en active Active
- 2004-07-01 AT AT04740520T patent/ATE350496T1/en active
- 2004-07-01 AU AU2004263608A patent/AU2004263608B2/en not_active Ceased
- 2004-07-01 ES ES04740520T patent/ES2279390T3/en active Active
- 2004-07-01 CN CN200480021306XA patent/CN1826417B/en not_active Expired - Fee Related
- 2004-07-01 EA EA200600302A patent/EA008735B1/en not_active IP Right Cessation
- 2004-07-19 TW TW093121469A patent/TW200508400A/en unknown
- 2004-07-22 AR ARP040102602A patent/AR045075A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP1660688A1 (en) | 2006-05-31 |
| BRPI0412256A (en) | 2006-09-19 |
| WO2005014868A1 (en) | 2005-02-17 |
| DE602004004159T2 (en) | 2007-10-11 |
| AR045075A1 (en) | 2005-10-12 |
| CA2532927C (en) | 2011-09-06 |
| AU2004263608A1 (en) | 2005-02-17 |
| AU2004263608B2 (en) | 2009-07-23 |
| US20070082312A1 (en) | 2007-04-12 |
| DE10333764B3 (en) | 2004-12-30 |
| EA200600302A1 (en) | 2006-06-30 |
| EP1660688B1 (en) | 2007-01-03 |
| CN1826417B (en) | 2012-06-20 |
| TW200508400A (en) | 2005-03-01 |
| BRPI0412256B1 (en) | 2015-06-09 |
| ZA200600897B (en) | 2007-05-30 |
| ATE350496T1 (en) | 2007-01-15 |
| ES2279390T3 (en) | 2007-08-16 |
| US8391331B2 (en) | 2013-03-05 |
| DE602004004159D1 (en) | 2007-02-15 |
| KR20060111902A (en) | 2006-10-30 |
| CN1826417A (en) | 2006-08-30 |
| EA008735B1 (en) | 2007-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20200831 |